Azo dyes for lakes.



UNITED f STATES PATENT OFFICE.

ADOLF WINTHER, AUciUs'r LEOPOLD LASKA, AND ARTHUR ZITSCHER, or orrnmmcn ON-THE-MAIN, GERMANY, ASSIGNORS TO CORPORATION OF CHEMISCHE FABRIK GRIESHEIM, ELEKTRON, OF FRANKFORT-ON-THE-MAIN, GERMANY.

AZO DYES FOR LAKES.

No Drawing.

the following is a specification.

, Our invention relates .to theinan'ufacture and production of new no dyes'which are especially adapted for the manufacture of pigment colors. These dyestuffs can be obtained by the combination ofsuch-diazo compounds of the benzene series, which contain at least one negative group, with the arylamids of the-2.3-oxynaphthoic acid.

The arylamids of the 2.3- oxynaphthoic a'cid can be easily obtained as des'cribed by Schopfi', Ber. der Deutschen C'lim. Gesell- .S Chdft, vol. 25, page 2743. Besides the 2.3-oxynaphthoic anilid itself the substitution products thereof come also intoconsideration, which can be obtained, when substituting for anilin the substitution products thereof, as for instance the homologues and the chloroand nitro-substitution products, by the reaction with 2.3-oxynaphthoic acid. The so obtained dyestuffs produce orange to Bordeaux lakes which are remarkable for their excellent fastness to oil and to light. We have found that the products substituted in the arylamidobody 1n ortho-position to the imido group gives more yellow shades than the corresponding para-substitution products.

The manufacture of the lakes can be carried out in a mineral acid solution, organic acid solutionor in neutral. or alkaline solution and the manufacture of dyestuffs and of lakes can be united of course in one operation.

The following examples will serve to illustrate the nature of our invention, parts being by weight: 7

Specification of Letters Patent.

the anilid of 2.3-oxynaphthoic acid obtained by dissolving this body in diluted caustic soda lye and by precipitating it again with diluted acetic acid. The dyestult-separates in shape of brilliant red flakes. When the 7 Patented Aug. 6, 1912.

Application filed March 12, 1912. Serial No. 683,320.

formation is completed, the dyestuff is filtered, washed with water until it shows neutral reaction and preferably used in the form of a paste. The dyestu'fi forms. in dry shape a bluish red powder which is soluble in concenerated sulfuric acid with blue-red color.

Example II: 12.8 parts of meta-chloroanilin are dissolved in 28.5 parts of hydrochloric acid (20 B.) and 100 parts of water and diazotized after cooling with ice by means of 6.9 parts of sodium nitrite.

The diazo solution is poured into a suspen-.

sion of 31.3 parts of the ortho-chloroanilid of 2.3 -oxynaphthoic acid, to which are added 20.4 parts of sodium acetate and which can be obtained by dissolving the ortho-chloroanilid of 2.3-oxynaphthoic acid Withdiluted caustic soda lye and by precipitating with diluted hydrochloric acid in presence of Turkey-red oil. vAfterthecombination is completed the precipitated dyestufl' is filtered oil and washed. It forms in dry shape a reddish orange powder and is soluble in concentrated sulfuric acid with bluish red color.

The structural formulas of the dye as produced by the two specific examples is probably as follows:

Example I:

ouacm properties of the pigment colors obtained according to this invention:

Colors prepared by Gives pigthe combination With ment of diazotized colors.

. Red. o-chloroamlm m chloroanum Thgigmhd oi 2.3oxynaphthoic Yelgwish p-chloroanilin a 2.4-dichloroanilin. Red. 2.S-dichitmianilin... ....do Red. 3.4-dichloroanilin. Red. 2.5-dichioroanflim. The p-toluidid of 2.3-oxynaph- Red.

. thoic. och1oroani1i.n Red. m-chloroam'lin The p-chloroauilid of 2.3 oxy- Red. p-chloroanilin naphthoic acid. Red. 2.5-dich1otoanilin. Red.

' Re d d is h o-chloroanilin orange. m-chloroanilin.. The o-chloroanilid of 2.3-oxy- Orange.

or naphthoic acid. Red. 2 5-dichloroanilm Yellgwlsh re gfig fi The 2.5-diehloroanilid 0i.2.3-oxy- 2.5-dichloroani1in. naphthmc Red. m-chloroanilin The p-anjsidid of 2.3-oxynaph- Red.

there acid. m-chloroanilin The beta-naphthalid of 2.3'oxy- Red.

naphthoic acid. pchloro-o-toluidim. The anilid of 2.3-oxynaphtho1c Red.

acid. m-m'troanilin... ..do Orange.- o-nitroamlm' ..do Yellgwish re p-nitro-o-toluidin... .....d0 Bluishred.

' Do The p-toluidid of 2.3-oxynaph- D0.

thoic acid. The pchloroanilid of 2.3-oxy- Do.

naphthoic acid. The o-chioroanilid of 2.3-oxy- Do.

naphthoic acid. The m-chloroanilid of 2.3Poxy- Do.

naphthoic acid. The 2.5-dichloroanilid of 2.3-oxy- Do.

naphthoic acid. Do. The m-nitroanilid of 2.3-oxy- Do.

naphthoic acid. Do The p-am'sidid of 2.3-oxynaph- Do.

thoic acid. lIlIlltl'O-PtOlllldill. Thegnilid of 2.3-oxymphthoic Bordeaux. aci 5-nitr0-2am'sidi11....

p-chl0ro-o-nitranilin o-chloro-p-nitranilin 2.4-dmitroanilin Now what we claim and desire to secure by Letters Patent is the following:

1. The process for the manufacture of new monoazo dyestuffs, especially adapted for preparing p gment colors, consisting in combining such diazo compounds of the benzene series, which contain at least one negative group, with the arylamids of the 2.3-oxynaphthoic acid.

2. As new articles the azo dyestuffs which can be obtained by combining such diazo compounds of the benzene series, which contain at least one negative roup, with the arylamids of the 2.3-oxynapithoic acid, which dyestuffs form in dry state brilliant reddish orange to bluish red powders entirely insoluble in water, soluble in concentrated sulfuric acid with very bluishred color, and yielding upon reduction with stannous chlorid and hydrochloric acid a substituted amin of the benzene seriesand an arylamid of the 1-amino-2-oxy-3- naphthoic acid; which d estufl's can be easily transformed into co or lakes of orange to Bordeaux tints.

In testimony, that we claim the foregoing as our invention, we have signed our names in presence of two witnesses, this 28th day of Febr'uary 1912.

ADOLF WIiI'rHER. AUGUST LEOPOLD LASKA. ARTHUR ZITSCHER.

Witnesses WILHELM WAWER, PETER Comm). 

